Legend block fails after enabling

I get a page full of errors once the block is enabled on a fresh install. The calendar displays, but the legend block does not. This is without any calendar related entries whatsoever, i.e., from Debut Event after it's own fresh install. Other, possibly related modules for date/time, are Timefield, plus the expected Date and Date API, Date iCal, and Registration - with all of them being the latest dev versions.

Notice: Undefined index: calendar_colors_type in theme_calendar_stripe_legend() (line 660 of C:\xampp\htdocs\commons73dev\profiles\commons\modules\contrib\calendar\theme\theme.inc).
Warning: array_key_exists() expects parameter 2 to be array, null given in theme_calendar_stripe_legend() (line 711 of C:\xampp\htdocs\commons73dev\profiles\commons\modules\contrib\calendar\theme\theme.inc).

The notice line shows only once, followed by dozens of the warning messages. This was installed on a local server (Apache 2.2.1, PHP 5.3.1, mySql 5.1) running Commons-7.x-3.x-dev with it's D7.15 core.

I've been finding lots of undefined index errors with other modules, where the issue is usually not having 'isset' null checking, so I presume that may be the case here as well - but - the array_key kind of warning isn't something I've seen before.